The PE seat on the A380 is not good for night flights (no real recline at all). It is fine for day flights, being spacious enough for work and in a smaller, quieter cabin. The food offering is quite similar to Economy. Many people think that an extra legroom Economy seat is actually better for night flights...
By comparison to the PE seat, the J seat on the A380 is OK and I would pay to upgrade to this on a night flight.